Outlook Cairn and Copper Mines - Drummond Wisconsin

From Reader Mike R:
I was wondering if you could help me identify or maybe shed some light on this rock carin i found up in northern Wisconsin.  Its located on a tall rock outcrop and is the highest spot around.  I found this back in the 80's and has always fascinated me.  Its in an area were not a lot people can get to.  In the same area our remnants of old copper mines too.

[In separate email, he continues:] 

The town its near is Drummond, Wisconsin.  I also  attached a photo of a stone tool and a chunk of copper i found near the carin.  A logging crew with heavy equipment was close to the carin and dug up the soil that revealed these artifacts.It is located near a couple of lakes too, but right above an old copper mine.  There is also a small pond nearby that could of been a old mine pit.  I have been exploring the area over the past few years pretty frequently, trying to find some of the other neat man made structures i found when i was younger.  Back in the 80's i came across a few of these carins and these small carved out holes in large rocks.  It has been tough to find these areas again after the loggers went through in the 90's and still going on today. I want to get all of them documented so hopefully a story can be told. So much of our past in north america is still to be told-at least i think so.

[And further email:]

I think these are ancient mines. On some of the nearby rock faces you can still see were the Native Americans built large fires to heat the rock up to get it to crack.  When i looked at your blog, i didnt realize the  amount of rock structures that may have been carved or placed in a way that represents creatures of the earth.  In my travels this year i am gonna keep a closer eye on the landscape.  The areas that i spend most of my time are in remote places that only have been logged once (1880's)and the soils have never been disturbed; a lot of rock outcrops and in general a very rocky terrain.  I attached a couple of pictures of the old copper mines i found this past fall.  They were pretty cool and i found one that you could go in a cave for about 30 feet!